Zen and Xander Undone

Zen and Xander are sisters-truly, madly, deeply sisters, and this is their last summer together.    Zen is the "good" girl with a black belt in karate and a newfound penchant for kicking heads. Xander is a wild scientific genius with a self-destructive streak a light-year long. They have three things in common: they're brown-eyed blondes, they've noticed the boy next door has turned into a hottie, and they miss their mom, who died almost a year ago.
   These sisters are surviving just fine-except Zen keeps getting into fights that are harder and harder to finish, while Xander spirals into a vortex of late-night parties, scary men, and drugs. What's worse, Xander has scholarships to the most coveted universities in the country, but she's about to ruin everything. Should Zen keep trying to protect Xander, or finally let her go? Complicated Sisterhood: "Good girl" Zen uses her fists while "wild child" Xander risks her future.
As one sister spirals, the other must decide how far she'll go to save her. The Boy Next Door: He's been their friend forever, but this summer Adam is suddenly a hottie. He might be the only thing holding the sisters together-or the one thing that could tear them apart. Last Summer Together: Before college sends them to opposite coasts, Zen and Xander must navigate one final, heartbreaking summer that will change their relationship forever.
Family Secrets: Their mother left them letters from beyond the grave, but they reveal a past she never shared. Uncovering the truth might shatter their memory of her completely.